Quarterly report pursuant to Section 13 or 15(d)

Condensed Combined Statements of Parent's Net Investment

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Condensed Combined Statements of Parent's Net Investment - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance as of beginning of period $ 1,262    
Net income 39 $ 33 $ 230
Balance as of end of period 1,273   1,262
Parent’s Net Investment      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Balance as of beginning of period 1,257 1,085 1,085
Net income 39 33  
Net transfers to Parent (14) (20)  
Cumulative effect of change in accounting standard     (15)
Balance as of end of period $ 1,267 $ 1,098 $ 1,257